<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>text</title>
    <style>
        .div1{
            width: 50px;
            height: 50px;
            border: 1px solid #000000;
        }
    </style>
    <script>

    </script>
</head>
<body>
    <div class="div1" >
        <div>
        </div>
    </div>
    
</body>
</html>